JP3374639B2 - Trance - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer used for various consumer appliances and the like.

[0002]

2. Description of the Related Art A conventional transformer will be described with reference to FIGS. The bobbin 3 of the conventional transformer is shown in FIG.
As shown in FIG. 4, it has a through hole 1 into which the magnetic core 4 is inserted,
Terminal 2 with a conductor wire wound around it and soldered to the conductor wire
Was exposed from the exterior resin. Then, two E-shaped magnetic cores 4 are inserted into the through holes 1 and combined to form a closed magnetic circuit, and a pair of U-shaped spring core bands 5 are attached to the outer circumference of the magnetic core 4 and elastically retained. And formed a transformer.

[0003]

In the transformer having the conventional structure, the magnetic core 4 inserted in the through hole of the bobbin 3 is magnetized by applying pressure from the insertion direction using a pair of U-shaped core bands 5. The core 4 was held and fixed, but the magnetic core 4 and the core band 5 are fixed only by the elastic force of the spring of the core band 5, and the combined magnetic core 4 is easily detached or displaced due to impact. However, there is a problem that stable electrical characteristics cannot be obtained.

Therefore, an object of the present invention is to solve the above problems and provide a transformer which can obtain stable electric characteristics.

[0005]

In order to achieve the above object, the present invention has a bobbin having a through hole, a winding wound around the outer periphery of the through hole, and a terminal protruding from the bobbin. The bobbin includes two magnetic cores that are inserted into the through holes of the bobbin and that form a closed magnetic circuit in combination with each other, and a core band that presses and holds the abutting surfaces of the two magnetic cores. Has a base at the bottom of the base, the terminals project from the base, and the core band has a U-shape with an intermediate portion between opposing portions, The first engaging portion is provided with a second engaging portion at the tip of the facing portion, and the facing portion presses the magnetic core in the direction of the abutting surface of the magnetic core, and the first engaging portion is attached to the magnetic core. A second engaging portion on the outer peripheral surface of the butting surface of Is brought into contact with the peripheral surface, it is obtained by a structure obtained by pressing the magnetic core in the vertical direction of the magnetic core by the first engaging portion and second engaging portion.

With the above structure, the first engaging portion in the middle portion of the core band is brought into contact with the outer peripheral surface of the abutting surface of the magnetic core, and the second engaging portion at the tip of the facing portion is brought into contact with the outer peripheral surface of the magnetic core. Since the two magnetic cores are pressed in the vertical direction of the magnetic cores, the first engaging portion can prevent the two magnetic cores from being displaced from the abutting surfaces, and the outer periphery of the abutting surfaces can be prevented. With the surface as a support point, the second engaging portion can press and hold the two magnetic cores in the vertical direction, and in addition to holding the magnetic core by the elastic force of the facing portion of the core band, holding the magnetic core by the core band. Can be made more reliable.

As a result, due to impact or the like, the two magnetic cores will not or will not easily deviate from their abutting surfaces, and the magnetic cores can be held securely and stable electrical characteristics can be obtained.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is
A bobbin having a through hole and having a winding wound around the outer periphery of the through hole, a terminal protruding from the bobbin, and a bobbin inserted into the through hole of the bobbin and combined to form a closed magnetic circuit. A magnetic core and a core band that presses and holds the abutting surfaces of the two magnetic cores, the bobbin has a base at the bottom of the through hole, and the terminals project from the base. The core band has a U-shape having an intermediate portion between the facing portions, a first engaging portion at the intermediate portion, and a second engaging portion at the tip of the facing portion.
Is provided, the magnetic core is pressed by the facing portion toward the abutting surface of the magnetic core, and the first engaging portion is provided on the outer peripheral surface of the abutting surface of the magnetic core, and the second engaging portion is provided. Is brought into contact with the outer peripheral surface of the magnetic core, and the magnetic core is pressed in the vertical direction of the magnetic core by the first engaging portion and the second engaging portion.

With the above structure, the first engaging portion in the middle portion of the core band is brought into contact with the outer peripheral surface of the abutting surface of the magnetic core, and the second engaging portion at the tip of the facing portion is brought into contact with the outer peripheral surface of the magnetic core. Since the two magnetic cores are pressed in the vertical direction of the magnetic cores, the first engaging portion can prevent the two magnetic cores from being displaced from the abutting surfaces, and the outer periphery of the abutting surfaces can be prevented. With the surface as a support point, the second engaging portion can press and hold the two magnetic cores in the vertical direction, and in addition to holding the magnetic core by the elastic force of the facing portion of the core band, holding the magnetic core by the core band. Can be made more reliable.

The invention according to claim 2 of the present invention is claim 1
In the invention described, the height of the surface of the base outside the through hole of the bobbin is lower than the height of the surface of the base inside the through hole of the bobbin, and the lower surface of the magnetic core exposed from the through hole of the bobbin. A space is provided between the bottom of the magnetic core and the base of the bobbin.

With the above structure, when the terminal protruding from the bobbin is soldered to a mounting board or the like, the lower surface of the magnetic core exposed from the through hole of the bobbin and the base of the bobbin corresponding to the lower surface of the magnetic core. Since the space is provided therebetween, the heat of the solder is less likely to be transmitted to the magnetic core, and the deterioration of the electrical characteristics of the magnetic core can be prevented.

The invention according to claim 3 of the present invention is the invention according to claim 1.
In the invention described above, a fitting portion that fits the second engaging portion is provided on the magnetic core, the second engaging portion is fitted to the fitting portion, and an intermediate portion is butted to the magnetic core. The magnetic core is pressed against the surface in a direction perpendicular to the abutting surface direction of the magnetic core by the second engaging portion and the intermediate portion.

With the above structure, the magnetic core can be pressed in the direction perpendicular to the abutting surface direction of the magnetic core, so that the magnetic core can be held more reliably.

The invention according to claim 4 of the present invention is the invention according to claim 3.
In the invention described above, the first engaging portion is provided on the lower side of the intermediate portion and the base is provided with a concave portion, the first engaging portion is a first convex piece, and the convex piece is a concave portion. It is configured to be inserted.

With the above construction, since the convex piece of the first engaging portion is inserted into the concave portion of the base, the convex piece of the first engaging portion can positionally be defined by the concave portion of the base and holds the magnetic core. It is possible to prevent the core band from shifting on the base.

The invention according to claim 5 of the present invention is the invention according to claim 3.
In the invention described above, the second engaging portion is a second convex piece,
The fitting portion is a groove that fits into the second convex piece, and the second convex piece is provided on the end side of the tip of the core band and is folded from the tip so as to be parallel to the middle portion of the core band. It has a curved structure.

With the above structure, the second convex piece of the second engaging portion is bent from the tip end so as to be parallel to the middle portion of the core band, and is fitted into the groove. When the magnetic core is pressed in the direction perpendicular to the abutting surface direction, the magnetic core can be reliably pressed by the second engaging portion, and the magnetic core can be held more firmly.

Hereinafter, a transformer according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a transformer according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the transformer.

1 and 2, a transformer according to an embodiment of the present invention has a through hole 1, a bobbin 3 having a winding wound around the outer periphery of the through hole 1, and a bobbin 3 protruding from the bobbin 3. Inserted into the through-hole 1 of the bobbin 3 and the terminal 2 thus made, the two E-shaped magnetic cores 4 which form a closed magnetic circuit in combination and the abutting surface 10 of the two magnetic cores 4 are pressed. And a core band 5 for holding the same.

The bobbin 3 has a base 1 at the bottom of the through hole 1.
1, the terminal 2 is projected from the middle of the side surface of the base 11, and the core band 5 has a U-shape having an intermediate portion 13 between the facing portions 12, and The first engaging portion 14 is provided on the lower side of the portion 13, and the second engaging portion 7 is provided on the upper end of the end of the facing portion 12.

The facing portion 12 of the core band 5 presses the magnetic core 4 in the abutting surface direction A of the magnetic core 4, and the first engaging portion 14 is placed on the lower surface of the outer periphery of the abutting surface 10 of the magnetic core 4. , The second engaging portion 7 is brought into contact with the upper portion of the outer peripheral surface of the magnetic core 4, and the magnetic core 4 is pressed in the vertical direction B of the magnetic core 4 by the first engaging portion 14 and the second engaging portion 7. It is made to have a configuration.

At this time, the base 1 in the through hole 1 of the bobbin 3
Base 11 outside the through hole 1 of the bobbin 3 than the height of the surface 1
Lower the height of the surface of the bobbin 3 near the side surface on the terminal 2 side,
A space 15 is provided between the lower surface of the magnetic core 4 exposed from the through hole 1 and the base 11 of the bobbin 3 corresponding to the lower surface of the magnetic core 4.

Further, the magnetic core 4 is provided with a fitting portion 6 for fitting with the second engaging portion 7, and the second engaging portion 7 is fitted into the fitting portion 6, and the intermediate portion 13 is provided. The first engaging portion 14 of the magnetic core 4 is brought into contact with the abutting surface 10 of the magnetic core 4, and the magnetic core 4 is moved by the second engaging portion 7 and the first engaging portion 14 of the intermediate portion 13.
The pressure is applied in the vertical direction C which is perpendicular to the butt surface direction A.

At this time, the second engaging portion 7 is the second convex piece, the fitting portion 6 is provided on the upper part of the magnetic core 4, and the groove is fitted to the second convex piece. The convex piece is provided on the upper side of the end side of the tip of the core band 5, and is bent from the tip so as to be parallel to the intermediate portion 13 of the core band 5.

Further, the first engaging portion 14 is provided on the lower side of the intermediate portion 13 so that the first engaging portion 14 is bent toward the magnetic core 4 side and the base 11 is provided.
A concave portion 16 is provided on the side surface of the first engaging portion 14 as a first convex piece, and the first convex piece is inserted into the concave portion 16.

The operation of the transformer having the above structure will be described below. First of the intermediate portion 13 of the core band 5
To the outer peripheral surface of the abutting surface 10 of the magnetic core 4,
Since the second engaging portion 7 at the tip of the facing portion 12 is brought into contact with the outer peripheral surface of the magnetic core 4 to press the two magnetic cores 4 in the vertical direction B of the magnetic core 4, the first engaging Two magnetic cores 4 by the part 14
Can be prevented from deviating from the abutting surface 10, and the outer peripheral surface of the abutting surface 10 is used as a support point.
By the second engaging portion 7, the two magnetic cores 4 can be pressed and held in the vertical direction B, and in addition to the holding by the elastic force of the facing portion 12 of the core band 5, the magnetic core 4 of the core band 5 can be held. The holding can be further ensured, and the two magnetic cores 4 can be separated or less likely to be displaced from their abutting surfaces 10 due to an impact or the like, and the magnetic core 4 can be reliably held and stable electric power can be obtained. The characteristics can be obtained.

Further, since the space 15 is provided between the lower surface of the magnetic core 4 exposed from the through hole 1 of the bobbin 3 and the base of the bobbin 3 corresponding to the lower surface of the magnetic core 4, the space 15 is provided from the bobbin 3. When the protruding terminal 2 is soldered to a mounting board or the like, the heat of the solder is less likely to be transferred to the magnetic core 4, and the deterioration of the electrical characteristics of the magnetic core 4 can be prevented.

Further, the magnetic core 4 is provided with a fitting portion 6 for fitting with the second engaging portion 7, the second engaging portion 7 is fitted into the fitting portion 6, and the intermediate portion 13 is provided. Since the magnetic core 4 is brought into contact with the abutting surface 10 of the magnetic core 4 and the second engaging portion 7 and the intermediate portion 13 press the magnetic core 4 in the vertical direction C perpendicular to the abutting surface direction A of the magnetic core 4, The magnetic core 4 can be pressed in the vertical direction C of the magnetic core 4, and the magnetic core 4 can be held more reliably.

At this time, the second convex piece of the second engaging portion 7 is bent from the tip so as to be parallel to the intermediate portion 13 of the core band 5, and fitted into the groove-like fitting portion 6. Therefore, the vertical direction C, which is perpendicular to the abutting surface direction A of the magnetic core 4,
When the magnetic core 4 is pressed, the magnetic core 4 is pressed by the second engaging portion 7.
Can be reliably pressed, and the magnetic core 4 can be held more firmly.

Further, the convex piece of the first engaging portion 14 is attached to the base 1
1 is inserted into the concave portion 16 on the side surface, the concave portion 1 of the base 11
The position of the convex piece of the first engaging portion 14 can be defined by 6, and the core band 5 holding the magnetic core 4 can be prevented from shifting on the base 11.

As described above, according to the embodiment of the present invention,
The two magnetic cores 4 can be pressed and held in the vertical direction B, and in addition to the elastic force of the facing portion 12 of the core band 5, the magnetic core 4 can be more reliably held by the core band 5. The magnetic cores 4 can be reliably held and stable electrical characteristics can be obtained because the two magnetic cores 4 are or are less likely to be displaced from their abutting surfaces 10 due to an impact or the like. .

Further, the core band 5 holding the magnetic core 4 can be prevented from shifting on the base 11, and the magnetic core 4 can be moved in the vertical direction C perpendicular to the direction A of the butting surface of the magnetic core 4.
Since it is possible to press, the magnetic core 4 can be held more reliably.

Furthermore, when the terminal 2 protruding from the bobbin 3 is soldered to a mounting board or the like, the heat of the solder is less likely to be transferred to the magnetic core 4, and the deterioration of the electrical characteristics of the magnetic core 4 can be prevented.

In the embodiment of the present invention, the space portion 1
Although 5 is provided only in the vicinity of the side surface of the base 11 on the terminal 2 side, the same effect can be obtained by providing all of the base 11 corresponding to the lower surface of the magnetic core 4 exposed from the through hole 1 of the bobbin 3. Can be obtained.

[0036]

As described above, according to the present invention, the first engaging portion at the middle portion of the core band is provided on the outer peripheral surface of the abutting surface of the magnetic core, and the second engaging portion at the tip of the facing portion is provided. Since the two magnetic cores are pressed against the outer peripheral surface of the magnetic core in the vertical direction of the magnetic core, the first engaging portion prevents the two magnetic cores from being displaced from the abutting surfaces. With the outer peripheral surface of this abutting surface as a support point, the second engaging portion can
The individual magnetic cores can be pressed and held in the vertical direction, and in addition to the holding by the elastic force of the facing portion of the core band, the holding of the magnetic core by the core band can be made more reliable.

As a result, due to impact or the like, the two magnetic cores will not or will not easily deviate from their abutting surfaces, and the magnetic cores can be securely held and stable electrical characteristics can be obtained. Can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view of a transformer according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the transformer.

FIG. 3 is a perspective view of a conventional transformer.

FIG. 4 is an exploded perspective view of the transformer.

[Explanation of symbols]

1 through hole 2 terminals 3 bobbins 4 magnetic core 5 core bands 6 Fitting part 7 Second engaging part 10 Butt faces 11 bases 12 Opposite part 13 Middle part 14 First engaging portion 15 Space section 16 recess

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takehiko Ogaki 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) Reference JP-A-6-251955 (JP, A) 36817 (JP, U) Actual opening 3-57903 (JP, U) Actual opening 61-109109 (JP, U) Actual opening 58-1535 (JP, U) Actual opening 4-131914 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01F 27/26

Claims (5)

(57) [Claims] 1. A bobbin having a through hole, a winding wound around the outer periphery of the through hole, a terminal protruding from the bobbin, and a bobbin inserted into the through hole of the bobbin,
The bobbin has two magnetic cores that form a closed magnetic circuit in combination with each other, and a core band that presses and holds the abutting surfaces of the two magnetic cores. The terminal is projected from the base, and the core band has a U-shape with an intermediate portion between the opposing portions, and the first engaging portion is provided in the intermediate portion. A second engaging portion is provided at the tip, and the facing portion presses the magnetic core in the direction of the butting surface of the magnetic core.
Of the magnetic core is brought into contact with the outer peripheral surface of the abutting surface of the magnetic core, the second engaging portion is brought into contact with the outer peripheral surface of the magnetic core, and the magnetic core is formed by the first engaging portion and the second engaging portion. A transformer that presses the magnetic core vertically. 2. The lower surface of the magnetic core exposed from the through hole of the bobbin is made lower than the height of the surface of the base inside the through hole of the bobbin so that the surface of the base is outside the through hole of the bobbin. 2. The transformer according to claim 1, wherein a space is provided between the bottom surface of the magnetic core and the base of the bobbin. 3. A magnetic core is provided with a fitting portion for fitting with a second engaging portion, the second engaging portion is fitted with the fitting portion, and an intermediate portion is butted to the magnetic core. 2. The transformer according to claim 1, wherein the transformer is brought into contact with a surface, and the magnetic core is pressed by the second engaging portion and the intermediate portion in a direction perpendicular to an abutting surface direction of the magnetic core. 4. The first engaging portion is provided on the lower side of the intermediate portion and the base is provided with a concave portion, the first engaging portion is a first convex piece, and the convex piece is a concave portion. The transformer according to claim 3, which is inserted. 5. The second engaging portion is a second convex piece, and the fitting portion is a groove that fits in the second convex piece, and the second convex piece is an edge of the tip of the core band. 4. The transformer according to claim 3, wherein the transformer is provided on the core and is bent from the tip so as to be parallel to the intermediate portion of the core band.